Windows Phone Blue: Microsoft's next tablet OS?

Could the Windows Phone operating system become Microsoft's OS of choice for 7- to 10-inch tablets? Based on new rumors, courtesy of Windows SuperSite's Paul Thurrott, this scenario isn't outside of the realm of possibility. Windows Phone Blue, which may or may not ultimately be christened Windows Phone 8.1, is the first "major" update to the Windows Phone 8 OS since Microsoft launched it in the fall of 2012. We've known about the existence of WP Blue for months. The latest rumors I've heard continue to peg Windows Phone Blue's release- to-manufacturing date sometime around "spring 2014."